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JAMB Physics 1991 Question 12

Question 12

Density and Upthrust

The mass of a stone is 15.0 g when completely immersed in water and 10.0 g when completely immersed in a liquid of relative density 2.0. The mass of the stone in air is

  1. A.5.0 g
  2. B.12.0 g
  3. C.20.0 g
  4. D.25.0 g.
Show the answer and explanation

Answer: C (20.0 g)

Explanation

Loss in the liquid is twice the loss in water: m − 10 = 2(m − 15), so m = 20 g.